Hi Jenna

Thank you for the feedback.

That is correct I have the Devastator Tank Mobile Robot Platform (Metal DC Gear Motor). Link where I bought it:

https://www.diyelectronics.co.za/store/dfrobot/2127-devastator-tank-mobile-robot-platform.html

The motor jumpers are enabled.

I have copied and uploaded the sample code as on the website.

Sample code I am using:

My dc motors that came with the kit are:

•12V dc motors, I have connected an external 12V 2A power supply to the motors themselves and they were functioning. 

• I am using 6x 1.5V batteries as described in the manual for the devastator.

• I have tried connecting the 12V 2A power supply instead of the 6x 1.5V batteries, but this had no effect either.

Concerning the board, I have used simple code to determine the board works with commands, simply by typing a character in the serial monitor and the board would respond with “hello there”.

Does this help, do you need any additional info or photos?

Kind Regards